The Research Status of Modular Multilevel Converter and its Capacitor Voltage Balancing Control

2014 ◽  
Vol 535 ◽  
pp. 153-156
Author(s):  
Ya Ai Chen ◽  
Peng Chen ◽  
Jing Hua Zhou
Keyword(s):  
Modular Multilevel Converter ◽  
Multilevel Converter ◽  
Topology Structure ◽  
Voltage Balancing ◽  
Research Status ◽  
Hvdc System ◽  
Capacitor Voltage ◽  
Working Principle ◽  
Balancing Control

The thesis mainly analyzes the topology structure and the working principle of MMC based VSC-HVDC system; introduces the characteristics and research status of its capacitor voltage balancing control. All of this will lay a foundation for the further research.

scholarly journals Circulating Current Suppression Control in Surrogate Network of MMC- HVDC System

2020 ◽  
Vol 8 (6S) ◽  
pp. 29-34
Keyword(s):  
Output Voltage ◽  
Electromagnetic Transients ◽  
Modular Multilevel Converter ◽  
Multilevel Converter ◽  
Voltage Balancing ◽  
Hvdc System ◽  
Circulating Current ◽  
Capacitor Voltage ◽  
Circulating Currents ◽  
Three Phases

Modular multilevel converter consists of hundreds of submodules (SMs) like half bridge and full bridge converters etc. These hundreds of SMs and electrical nodes poses challenges while computing electromagnetic transients (EMTs). This problem becomes more complex while computed in real-time. To overcome this, an equivalent topology to model MMC arm/valve called surrogate network is utilized. But, the major ambiguity integrated with surrogate network model is SM capacitor voltage balancing. This leads to variation in voltage among the three phases which are parallel and produces circulating current between the three phases. A control circuitry is proposed in this paper to suppress/minimize circulating currents between the phases. Apart from circulating current suppression, the ‘ac’ output voltage is also enhanced at the converter with this proposed controller. Simulation is carried out in RSCAD software using RTDS simulator.

VHDL Implementation of Capacitor Voltage Balancing Control with Level-Shifted PWM for Modular Multilevel Converter

2016 ◽  
Vol 7 (1) ◽  
pp. 94
Author(s):  
Chuen Ling Toh ◽  
Lars Einar Norum
Keyword(s):  
Pulse Width Modulation ◽  
Power Transmission ◽  
Small Scale ◽  
Modular Multilevel Converter ◽  
Multilevel Converter ◽  
Voltage Balancing ◽  
High Voltage Direct Current ◽  
Capacitor Voltage ◽  
Balancing Control ◽  
Vhdl Implementation

Power electronics converters are a key component in high voltage direct current (HVDC) power transmission. The modular multilevel converter (MMC) is one of the latest topologies to be proposed for this application. An MMC generates multilevel output voltage waveforms which reduces the harmonics contents significantly. This paper presents a VHDL implementation of the capacitor voltage balancing control and level-shifted pulse width modulation (LSPWM) for MMC. The objective is to minimize the processing time with minimum gate counts. The design details are fully described and validated experimentally. An experiment is conducted on a small scale MMC prototype with two units of power cells on each arm. The test results are enclosed and discussed.

scholarly journals A Novel Diode-Clamped Modular Multilevel Converter With Simplified Capacitor Voltage-Balancing Control

2017 ◽  
Vol 64 (11) ◽  
pp. 8843-8854 ◽  
Author(s):  
Xiangdong Liu ◽  
Jingliang Lv ◽  
Congzhe Gao ◽  
Zhen Chen ◽  
Youguang Guo ◽  
...  
Keyword(s):  
Modular Multilevel Converter ◽  
Multilevel Converter ◽  
Voltage Balancing ◽  
Capacitor Voltage ◽  
Balancing Control
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